Definitive 650 top end swap thread?

[tehsilver95lx]

I've been searching for a while,on google and the infamous search of the threads,i cant really find any how to...or specifics.

I'm working with a 85 gs550l and an 83' 650 engine. if any guidance/tips can be given, it'd be appreciated!

[Nessism]

I've been searching for a while,on google and the infamous search of the threads,i cant really find any how to...or specifics.

I'm working with a 85 gs550l and an 83' 650 engine. if any guidance/tips can be given, it'd be appreciated!

You can not put a 650 top end on an '85 550 (or any 2nd gen 550 for that matter).

Oh, and I'm surprised by your comment about not finding info on the swap. There are dozens of different threads on this topic.

[tkent02]

They all have one thing in common, they start with eight valve 550s.

[tehsilver95lx]

You can not put a 650 top end on an '85 550 (or any 2nd gen 550 for that matter).

why's that? I'm sorry for all the questions, I Don't know much on the subject...any guidance is highly appreciated.

and to spite the threads i did pull up,nothing was instructional.

[Old Colt]

Correct me if I am wrong, the GS550L was always an 8V motor. This model did not change to the 16V motor in '83.
I have an '84 550L motor and frame here that is an 8V. Only difference from the early engines are the early ones had straight cut primary gears. The later crank and clutch were helical gears.

[tom203]

Look at some part fiches.... 83 550's went to 16 valve.

http://www.alpha-sports.com/spst/1983%20GS550L/04.htm?q=suzuki-parts

[tkent02]

I thought when they went to the Siamese carburetors they went to a 16 valve engine?

[Guest]

The '85 550L had the 16v engine, siamesed carbs and a monoshock rear end.

https://www.bikepics.com/pictures/2152418/

[Nessism]

Correct me if I am wrong, the GS550L was always an 8V motor. This model did not change to the 16V motor in '83.
I have an '84 550L motor and frame here that is an 8V. Only difference from the early engines are the early ones had straight cut primary gears. The later crank and clutch were helical gears.

Nope. That bike has a 16V engine.